Case Control Study
Copyright ©The Author(s) 2016.
World J Gastroenterol. Mar 28, 2016; 22(12): 3372-3380
Published online Mar 28, 2016. doi: 10.3748/wjg.v22.i12.3372
Table 1 Age, sex, and genotype frequencies of the cases and controls n (%)
VariableCasesControlsP value1
n = 727n = 736
Age (mean ± SD), yr60.3 ± 12.860.7 ± 13.00.639
Gender0.751
Male410 (56.4)409 (55.6)
Female317 (43.6)327 (44.4)
Colon/rectum, n352/375
OGG1 Ser326Cys0.021
Ser/Ser93 (13.0)125 (17.1)
Ser/Cys363 (50.8)324 (44.4)
Cys/Cys258 (36.1)281 (38.5)
Missing136
OGG1 11657A/G0.318
A/A648 (91.9)654 (90.1)
A/G55 (7.8)72 (9.9)
G/G2 (0.3)0 (0.0)
Missing2210
OGG1 Arg154His0.158
Arg/Arg720 (100.0)720 (99.7)
Arg/His0 (0.0)2 (0.3)
His/His0 (0.0)0 (0.0)
Missing714
APE1 Asp148Glu0.567
Asp/Asp236 (33.0)249 (34.3)
Asp/Glu349 (48.8)361 (49.7)
Glu/Glu130 (18.2)117 (16.1)
Missing129
APE1 T-656G0.876
T/T217 (30.1)211 (28.9)
T/G368 (51.0)380 (52.0)
G/G136 (18.9)140 (19.2)
Missing65
Table 2 Distribution of OGG1 and APE1 polymorphisms between cases and controls n (%)
GenotypeCasesControlsOR (95%CI)1P value
OGG1 Ser326Cys
Ser/Ser93 (13.0)125 (17.1)1.00 (ref)
Ser/Cys363 (50.8)324 (44.4)1.51 (1.11-2.05)0.009
Cys/Cys258 (36.1)281 (38.5)1.23 (0.90-1.69)0.198
Ser/Cys + Cys/Cys621 (87.0)605 (82.9)1.38 (1.03-1.85)0.030
OGG1 11657A/G
A/A648 (91.9)654 (90.1)1.00 (ref)
A/G55 (7.8)72 (9.9)0.77 (0.53-1.12)0.168
G/G2 (0.3)0 (0.0)-
A/G + G/G57 (8.1)72 (9.9)0.80 (0.56-1.15)0.230
APE1 Asp148Glu
Asp/Asp236 (33.0)249 (34.3)1.00 (ref)
Asp/Glu349 (48.8)361 (49.7)1.02 (0.81-1.29)0.864
Glu/Glu130 (18.2)117 (16.1)1.17 (0.86-1.60)0.308
Asp/Glu + Glu/Glu479 (67.0)478 (65.8)1.06 (0.85-1.32)0.615
APE1 T-656G
T/T217 (30.1)211 (28.9)1.00 (ref)
T/G368 (51.0)380 (52.0)0.94 (0.74-1.20)0.630
G/G136 (18.9)140 (19.2)0.95 (0.70-1.28)0.731
T/G + G/G504 (69.9)520 (71.1)0.95 (0.75-1.18)0.621
Table 3 Odds ratio and 95%CI of two OGG1 single nucleotide polymorphisms for colorectal cancer stratified by sex, age at diagnosis, and tumor site and stage
OGG1 Ser326Cys
OGG1 11657A/G
Ser/Ser
Ser/Cys + Cys/Cys
A/A
A/G + G/G
No.1OR (95%CI)2No.1OR (95%CI)2No.1OR (95%CI)2No.1OR (95%CI)2
Gender
Male50/671.00 (ref)350/3401.38 (0.93-2.05)364/3581.00 (ref)31/470.65 (0.40-1.05)
Female43/581.00 (ref)271/2651.38 (0.90-2.12)284/2961.00 (ref)26/251.09 (0.61-1.93)
Age at diagnosis (yr)
≤ 6044/541.00 (ref)275/2641.28 (0.83-1.97)292/2831.00 (ref)23/320.70 (0.40-1.22)
> 6049/711.00 (ref)346/3411.47 (0.99-2.17)356/3711.00 (ref)34/400.89 (0.55-1.43)
Tumor site
Colon45/1251.00 (ref)299/6051.39 (0.96-2.01)316/6541.00 (ref)23/720.67 (0.41-1.09)
Rectum48/1251.00 (ref)322/6051.39 (0.97-1.99)332/6541.00 (ref)34/720.93 (0.61-1.43)
Stage
0, I, II46/1251.00 (ref)283/6051.28 (0.88-1.84)307/6541.00 (ref)20/720.59 (0.35-0.98)a
III, IV47/1251.00 (ref)338/6051.48 (1.03-2.13)a341/6541.00 (ref)37/720.99 (0.65-1.51)
Table 4 Odds ratio and 95%CI of two APE1 single nucleotide polymorphisms for colorectal cancer stratified by sex, age at diagnosis, and tumor site and stage
APE1 Asp148Glu
APE1 T-656G
Asp/Asp
Asp/Glu + Glu/Glu
T/T
T/G + G/G
No.1OR (95%CI)2No.1OR (95%CI)2No.1OR (95%CI)2No.1OR (95%CI)2
Gender
Male137/1221.00 (ref)264/2830.83 (0.62-1.12)128/1111.00 (ref)277/2960.81 (0.60-1.10)
Female99/1271.00 (ref)215/1951.41 (1.02-1.96)a89/1001.00 (ref)227/2241.14 (0.81-1.60)
Age at diagnosis (yr)
≤ 60105/1101.00 (ref)213/2051.09 (0.78-1.51)108/991.00 (ref)215/2190.90 (0.65-1.26)
> 60131/1391.00 (ref)266/2731.03 (0.77-1.38)109/1121.00 (ref)289/3010.99 (0.73-1.35)
Tumor site
Colon114/2491.00 (ref)231/4781.06 (0.81-1.40)105/2111.00 (ref)244/5200.94 (0.71-1.25)
Rectum122/2491.00 (ref)248/4781.05 (0.81-1.38)112/2111.00 (ref)260/5200.95 (0.72-1.24)
Stage
0, I, II106/2491.00 (ref)226/4781.11 (0.84-1.47)107/2111.00 (ref)226/5200.85 (0.64-1.12)
III, IV130/2491.00 (ref)253/4781.02 (0.79-1.33)110/2111.00 (ref)278/5201.03 (0.79-1.36)
Table 5 Odds ratio and 95%CI of APE1 haplotypes for colorectal cancer stratified by sex, age at diagnosis, and tumor site and stage
APE1 Asp148Glu/T-656G
Asp/T
Asp/G
Glu/T
Glu/G
Ca/Co (%)1OR (95%CI)2Ca/Co (%)1OR (95%CI)2Ca/Co (%)1OR (95%CI)2Ca/Co (%)1OR (95%CI)2
All41.1/41.51.00 (ref)16.3/17.70.93 (0.75-1.15)14.5/13.41.09 (0.87-1.37)28.1/27.51.03 (0.86-1.24)
Gender
Male42.5/40.01.00 (ref)16.0/16.80.87 (0.66-1.16)14.5/14.60.91 (0.67-1.22)27.1/29.70.84 (0.66-1.06)
Female39.3/44.61.00 (ref)16.7/18.91.00 (0.73-1.36)14.5/11.81.39 (0.98-1.97)29.5/24.71.36 (1.03-1.78)a
Age at diagnosis (yr)
≤ 6042.1/42.71.00 (ref)17.1/17.21.01 (0.74-1.38)15.7/14.81.08 (0.77-1.50)25.0/25.31.00 (0.76-1.32)
> 6040.3/40.51.00 (ref)15.6/18.10.87 (0.65-1.15)13.5/12.31.10 (0.81-1.50)30.6/29.11.06 (0.84-1.34)
Tumor site
Colon40.4/41.51.00 (ref)16.7/17.70.96 (0.74-1.25)15.5/13.41.20 (0.91-1.58)27.4/27.51.03 (0.82-1.28)
Rectum41.7/41.51.00 (ref)16.0/17.70.90 (0.69-1.16)13.5/13.40.99 (0.75-1.31)28.8/27.51.04 (0.84-1.29)
Stage
0, I, II41.1/41.51.00 (ref)15.8/17.70.90 (0.69-1.17)14.9/13.41.14 (0.86-1.51)28.2/27.51.02 (0.82-1.28)
III, IV41.1/41.51.00 (ref)16.7/17.70.95 (0.74-1.23)14.1/13.41.06 (0.81-1.39)28.1/27.51.04 (0.84-1.29)